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PC87306 Datasheet(PDF) 97 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87306
Description  PC87306 SuperI/OTM Enhanced Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, Infrared Interface, IEEE 1284 Pa
PDF  110 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87306 Datasheet(HTML) 97 Page - National Semiconductor (TI)

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120 Electrical Characteristics (Continued)
1224 Baud Out Timing
Symbol
Parameter
Conditions
Min
Max
Units
N
Baud Divisor
1
65535
ns
tBHD
Baud Output Positive Edge Delay
CLK e 24 MHz2 100 pF Load
56
ns
tBLD
Baud Output Negative Edge Delay
CLK e 24 MHz2 100 pF Load
56
ns
TLC12379 – 73
FIGURE 12-5 Baud Out Timing
1225 Transmitter Timing
Symbol
Parameter
Min
Max
Units
tIRTXW
IRTX Pulse Width
16 ms
BAUD OUT Cycles
tHR
Delay from WR (WR THR) to Reset IRQ
40
ns
tIR
Delay from RD (RD IIR) to Reset IRQ (THRE)
55
ns
tIRS
Delay from Initial IRQ Reset to Transmit Start
8
24
Baud Out Cycles
tSI
Delay from Initial Write to IRQ
16
24
Baud Out Cycles
tSTI
Delay from Start Bit to IRQ (THRE)
8
Baud Out Cycles
TLC12379 – 74
Note 1
See Microprocessor Write cycle timing
Figure 12-3
Note 2
See Microprocessor Read cycle timing
Figure 12-2
FIGURE 12-6 Transmitter Timing
97



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